Special scale inhibitor for reverse osmosis membrane water treatment system

A technology for water treatment systems and reverse osmosis membranes, applied in the field of scale inhibitors, can solve problems such as deepening of water concentration polarization on both sides of the membrane, lower water production rate of reverse osmosis membranes, and increased salt concentration on the side of concentrated brine, achieving significant Scale inhibition, increase calcium tolerance, and reduce cleaning times

Inactive Publication Date: 2017-06-13
云南天朗环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concentration multiple of concentrated brine is up to 4 times, but it is generally lower than 4 times in actual operation
During the operation of the equipment, the pressure will cause the polarization of the water concentration on both sides of the membrane to deepen, and will also increase the salt concentration on the brine side
Concentrated brine contains a large amount of precipitable substances, which will cause fouling of the reverse osmosis membrane after a long time, block the membrane pores, reduce the water production rate of the reverse osmosis membrane, increase the operating cost, and even cause the reverse osmosis membrane to be scrapped

Method used

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  • Special scale inhibitor for reverse osmosis membrane water treatment system
  • Special scale inhibitor for reverse osmosis membrane water treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Prepare materials according to the following components by mass:

[0025] Hydroxyethylidene diphosphonic acid (HEDP) 1 part,

[0026] 3 parts of 2-phospho-1,2,4-butane tricarboxylate (PBTCA),

[0027] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) 3 parts,

[0028] 13 parts of water;

[0029] (2) Mix the components in step (1) to obtain the special antiscalant for reverse osmosis membrane water treatment system.

Embodiment 2

[0031] (1) Prepare materials according to the following components by mass:

[0032] Hydroxyethylidene diphosphonic acid (HEDP) 2 parts,

[0033] 1 part of 2-phospho-1,2,4-butane tricarboxylate (PBTCA),

[0034] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) 2 parts,

[0035] 5 parts of water;

[0036] (2) Mix the components in step (1) to obtain the special antiscalant for reverse osmosis membrane water treatment system.

Embodiment 3

[0038] (1) Prepare materials according to the following components by mass:

[0039] Hydroxyethylidene diphosphonic acid (HEDP) 5 parts,

[0040] 9 parts of 2-phospho-1,2,4-butane tricarboxylate (PBTCA),

[0041] Acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer (AA-AMPS) 1 part,

[0042] 15 parts of water;

[0043] (2) Mix the components in step (1) to obtain the special antiscalant for reverse osmosis membrane water treatment system.

[0044] The different proportions of the components in the present invention directly affect the proportions of various groups in the scale inhibitor, and further affect the scale inhibition performance of the agent. By adjusting the mass fraction ratio of each component, the scale inhibition performance of the scale inhibitor was explored. preferred

[0045] Hydroxyethylidene diphosphonic acid (HEDP) 1-4 parts,

[0046] 1-9 parts of 2-phospho-1,2,4-butane tricarboxylate (PBTCA),

[0047] 2-3 parts of acrylic acid-2-acry...

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Abstract

The invention relates to a special scale inhibitor for a reverse osmosis membrane water treatment system. The special scale inhibitor is prepared from the following components in parts by mass: 1 to 5 parts of hydroxyethanediphosphonic acid, 1 to 9 parts of 2-phosphonobutane-1,2,4-tricarboxylic acid, 1 to 3 parts of acrylic acid-2-acrylamido-2-methyl propyl sulfonic acid copolymer, and 5 to 15 parts of water. The scale inhibitor has the advantages that the scaling of inorganic matters at the membrane surface is effectively controlled, the water production rate and water production quality of the membrane system are effectively improved, the cleaning frequency of the membrane system is reduced, the service life of the membrane is prolonged, and the operation cost of the membrane system is reduced; the special scale inhibitor for reverse osmosis is mainly formed by compounding organic phosphine and low-molecular polycarboxylic acid, and contains functional groups of carboxylic groups, hydroxyl groups, phosphonic groups, sulfonic groups and amide groups, so that the secondary scaling of calcium phosphate is prevented, and the precipitation of adhering particles due to exceeding of critical concentration caused by change of water quality can be effectively inhibited.

Description

technical field [0001] The invention relates to a scale inhibitor, in particular to a special scale inhibitor for a reverse osmosis membrane water treatment system. Background technique [0002] The reverse osmosis membrane uses the pressure difference as the driving force to separate the solvent from the solution. The solvent is obtained on one side of the membrane, and the concentrated brine is obtained on the other side. [0003] At present, most of the reverse osmosis in my country is designed to operate in the second stage, and the recovery rate is designed at 75%. The concentration ratio of concentrated brine is up to 4 times, but it is generally lower than 4 times in actual operation. During the operation of the equipment, the pressure will cause the polarization of the water concentration on both sides of the membrane to deepen, and will also increase the salt concentration on the concentrated brine side. Concentrated brine contains a large amount of precipitable s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F5/12C02F5/14B01D65/08
CPCB01D65/08C02F1/441C02F5/12C02F5/14C02F2303/22
Inventor 钱永祥王长胜毛继红李志芹刘缘缘辛剑赵鹏徐祯张林
Owner 云南天朗环境科技有限公司
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